HP Z640 Guia do Utilizador descarregar pdf (Página 57)

●

Avoid contact with pins, leads, or circuitry.

●

Place reusable electrostatic-sensitive parts from assemblies in protective packaging or

nonconductive foam.

Personal grounding

methods and

equipment

Use the following items to help prevent ESD damage:

●

Wrist straps — These are flexible straps with a maximum of one megohm ± 10% resistance in the

ground cords. To provide a proper ground, wear the strap against bare skin. The ground cord must

be connected and fit snugly into the banana plug connector on the grounding mat or computer.

●

Heel straps, toe straps, and boot straps — These can be used at standing computers and are

compatible with most types of shoes or boots. On conductive floors or dissipative floor mats, use

them on both feet with a maximum of one megohm ± 10% resistance between the operator and

ground.

Static shielding

materials

Static shielding materials provide the following levels of protection.

Method

Antistatic plastic

Carbon-loaded plastic

Metalized laminate

Voltage

1,500V

7,500V

15,000V

Grounding the work

area to prevent static

damage

●

Cover the work surface with approved

static-dissipative material. Use a wrist

strap connected to the work surface, and

properly grounded tools and equipment.

●

Use static-dissipative mats, foot straps, or

air ionizers to give added protection.

●

Handle electrostatic-sensitive components,

parts, and assemblies by the case or PCB

laminate. Handle them only in static-free

work areas.

●

Disconnect power and input signals before

inserting and removing connectors or test

equipment.

●

Use fixtures made of static-safe materials

when fixtures must directly contact dissipative

surfaces.

●

Keep work area free of nonconductive

materials, such as plastic assembly aids and

Styrofoam.

●

Use field service tools (such as cutters,

screwdrivers, and vacuums) that are

conductive.

Recommended ESD

prevention materials

and equipment

●

Antistatic tape

●

Antistatic smocks, aprons, and sleeve

protectors

●

Conductive bins and other assembly or

soldering aids

●

Conductive foam

●

Conductive tabletop computers with a

ground cord of one megohm ± 10%

resistance

●

Static-dissipative table or floor mats with a

hard-tie to ground

●

Field service kits

●

Static awareness labels

●

Wrist straps and footwear straps providing one

megohm ± 10% resistance

●

Material-handling packages

●

Conductive plastic bags

●

Conductive plastic tubes

●

Conductive tote boxes

●

Opaque shielding bags

●

Transparent metallized shielding bags

●

Transparent shielding tubes

Service considerations 47

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